Black on transom
#31
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I think Mercruiser has a factory reflash for the PCM as well, but pretty sure the PCM's need to sent into Merc as well.
#32
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Besides the mechanical aspects of the creation of the soot, read up here, wipes right off.
http://www.offshoreonly.com/forums/3658736-post50.html
http://www.offshoreonly.com/forums/3658736-post50.html